* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    background-color: #0f1c3c;
    color: #fff;
}

.dashboard {
    padding: 20px;
    min-height: 100vh;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

header h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

.update-time {
    font-size: 14px;
    color: #8f9bba;
}

.overview-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

.card {
    background-color: #1e2b4a;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.card h3 {
    font-size: 16px;
    margin-bottom: 10px;
    color: #8f9bba;
}

.card .number {
    font-size: 24px;
    font-weight: bold;
    color: #00f0ff;
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.chart-wrapper {
    background-color: #1e2b4a;
    padding: 20px;
    border-radius: 8px;
}

.chart {
    height: 300px;
    width: 100%;
}

.full-width {
    grid-column: span 2;
}

@media (max-width: 768px) {
    .overview-cards,
    .charts-container {
        grid-template-columns: 1fr;
    }

    .full-width {
        grid-column: span 1;
    }
}
